leds: qpnp-wled: Update AMOLED_VOUT programming

For newer PMICs like pmicobalt, AMOLED_VOUT can be programmed via
independent registers. Also the option to configure AVDD voltage
through SWIRE and SPMI mode is present. Add support to program
the AVDD voltage and mode through these registers. AVDD TRIM
adjustment is needed only for pmi8952 and pmi8994. It is not
needed for pmicobalt. Support it.

CRs-Fixed: 1051250
Change-Id: Ia5cc4a6bbf6b6d0d86e13cec7da167f8a49b859d
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>